This gist demonstrates how to get dynamically a value from request header in Spring web stack on any layer different from `@Controller`

how-to-get-value-from-header-dynamically.java

@Component
@RequiredArgsConstructor
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
public class HeaderValueProvider implements Supplier<String> { //supplier interface just for the API segregation
	private final HttpServletRequest httpServletRequest;

	@Override
	public String get() {
		return httpServletRequest.getHeader("someHeader");
	}
}
/* ... */
/* Usage */
@RestController
@RequestMapping("/demo")
@RequiredArgsConstructor
public class TestController {

	private final Supplier<String> headerValueProvider;

	@GetMapping("/fromHeader")
	public String valueFromYourHeader() {
		return headerValueProvider.get();
	}
}
/* Usage */